10/06/2026 updated
100 % available
Freelance Full-Stack SaaS Engineer | React · TypeScript · Cloudflare
Vilnius, Lithuania
Only remote
Gesellenbrief – Elektroniker, Fachrichtung Energie- und GebäudetechnikAbout me
I help SaaS teams transform unstable or unfinished products into maintainable, tested and deployable systems: React/TypeScript, Cloudflare Workers, Hono, D1/KV/R2, Auth, Billing, Admin Tools, CI/CD, Playwright/Vitest and Security Hardening.
GitHub ActionsSoftware as a ServiceGitHubJSONTypeScriptWorkflowsReact.jsBackendGitLabCloudflareFront End Software Development
Skills & Capabilities
Full-Stack SaaS Development - Advanced
• Build production-ready SaaS and web platforms with React, TypeScript, Tailwind CSS and Vite.
• Implement complete product areas: authentication, RBAC, admin dashboards, billing, support workflows and clean frontend/backend interfaces.
Cloudflare Edge Backend - Advanced
• Build serverless backends with Cloudflare Workers, Hono, D1, KV and R2.
• Design APIs, data models, storage flows, caching, file handling, structured errors and deployment-ready backend setups.
Billing & Invoicing - Strong Practical Experience
• Implement SaaS billing flows, payment provider abstraction, Stripe/Revolut integration and admin billing workflows.
• Build VAT-aware logic based on customer country, invoices, receipts, refunds, credit notes and operational billing records.
Support Ticket Systems - Strong Practical Experience
• Build customer ticket flows, admin support consoles, assignments, attachments, escalation logic and workflow automation.
• Combine product engineering with real customer support experience to improve triage, diagnostics and issue resolution.
Automated i18n & Localization - Advanced
• Build automated i18n pipelines with structured translation keys, locale generation, fallback handling and missing-key detection.
• Support multilingual SaaS rollouts with localized UI, legal, billing, support and product content.
CI/CD, Testing & Release Hardening - Advanced
• Build GitHub Actions pipelines, self-hosted runner workflows, release checks and quality gates.
• Use Vitest and Playwright for unit, regression and E2E testing to support reproducible releases.
Security & Privacy-First Engineering - Strong Practical Experience
• Apply OWASP Top 10 awareness, session hardening, CSRF protection, rate limiting, CSP and secure authentication flows.
• Build privacy-conscious product logic with traceable, robust and abuse-resistant defaults.
Technical Project Management - Strong Practical Experience
• Coordinate scope, backlog structure, acceptance criteria, stakeholder communication, risks, issues and change control.
• Prepare documentation, handovers, release planning and structured delivery in production-sensitive environments.
Incident Handling & Support-Oriented Engineering - Strong Practical Experience
• Analyze issues systematically, reproduce errors, prepare technical escalations and document issue context.
• Design systems with support effort, troubleshooting quality and user satisfaction in mind.
Experience
Professional experience0 - 5 years
Freelancer since2025
Languages
GermanNative speakerEnglishFluentRussianBasic knowledgeLithuanianBasic knowledge
Project history
Architecture and implementation of a production-ready SaaS foundation on Cloudflare Workers with Hono, D1/KV/R2, React, and TypeScript. Delivery of authentication, role-based administration, billing abstraction, i18n with 58 locales, and support workflows. Delivery hardening through CI/CD, GitHub Actions, automated testing with Vitest and Playwright, and release checks. Focus on privacy-first engineering, session hardening, CSRF protection, rate limiting, and secure product logic.
Omni-channel Tier 1/2 support via ticketing, chat, and email. Structured troubleshooting, technical escalations with actionable diagnostics, reproduction steps, and knowledge base maintenance. Remote work in an international support environment.
Management of infrastructure and technical rollout projects in production-sensitive environments in Germany. Coordination of stakeholders, vendors, timelines, risks, documentation, and handovers. Translation of operational and compliance requirements into practical procedures, acceptance criteria, and structured project execution.